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An experiment to investigate the Effect of light intensity on The rate of photosynthesis.

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Introduction

Simon Cooke L5D An experiment to investigate the Effect of light intensity on The rate of photosynthesis Introduction Photosynthetic takes place in the chloroplasts of green plant cells; it can produce simple sugars using carbon dioxide and water causing the release of sugar and oxygen. The chemical equation of photosynthesis is: 6CO2 + 6H20 C6 H12 O6 + 6O2 it has been proven many times that plants need light to be able to photosynthesize , so you can say that without light the plant would neither photosynthesize or survive. The reason light intensity is being used compared to whether or not a plant needs light. Is because the experiment wants to show that the rates of photosynthesis will vary according to how much light from a light bulb will be trapped in the chloroplasts, in the leaf. The more energy trapped the more efficient a chemical reaction can take place and the speed of photosynthesis will increase. There are many things which can affect the photosynthesis of a plant such as light intensity, temperature and carbon dioxide levels. There will be a maximum level of photosynthesis during the experiment it is called a limiting factor. ...read more.

Middle

Then the lab blinds were pulled down so that no light could come from the windows and the lights were turned off. A desk lamp was set up facing the Elodea, a meter ruler laid along side the lamp so that the distance could be measured. A stop clock was set and the numbers of bubbles were recorded down. Each distance was done twice so you had some results that you could compare against each other. Then every two minutes the lamp was moved back 5 cm each time and then left for two minutes and once again the results were recorded down. Prediction I predict that the higher the light intensity increases, so will photosynthesis. The lower the light intensity the slower the rate of photosynthesis and eventually it will decrease in l Simon Cooke L5D level. Though eventually how ever high the height intensity is the rate of photosynthesis will level off. Results Distance (cm) Number of bubbles counted (every two minutes) Averages 0 230 0 229 5 227 5 227 10 220 10 219 15 190 15 191 20 153 20 148 Analysis My graph shows that the closer the distances of the light source the higher the rate of photosynthesis. ...read more.

Conclusion

If I repeated the experiment I would use a lamp with out a cover around it. Also I would make the time you counted the bubbles in longer possibly by another minute and a half, as two minutes are not a long enough time to fully see photosynthesis at its best. I would also give my self a longer time to do the experiment in so I could get an even more reliable graph with a limiting factor which could back up my evidence of photosynthesis. I would be more prepare next time so that I could get ready the apparatus more quickly and get on with the experiment, I would finally have left a gap of time between when the lamp was moved to a new distance and the recording of the bubbles began so that the Elodea could adapt to the new changes before running straight on with the next set of the results. I am happy with the experiment as I proved that light intensity has an effect on the rate of photosynthesis. I have a reliable set of results and graph with no anomalies my experiment had a low error percentage. ...read more.

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